Product Overview

1/23/2018 ESP32 Environment Sensor Shield Hookup Guide - learn.sparkfun.com
https://learn.sparkfun.com/tutorials/esp32-environment-sensor-shield-hookup-guide?_ga=2.200929641.659504291.1516640116-204410570.1509632…
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Rainfall
The weather station will also provide you with a rainfall gauge. Much like the wind speed gauge, the rainfall gauge generates ticks
to tally the amount of rain that has fallen. Count ticks to determine how much rain has fallen recently. Each tick represents 0.011"
(0.28mm) of rainfall. This sensor is connected to pin 25 of the ESP32.